nvim/lua/plugins/lsp.lua

return {
  -- Main LSP Configuration
  "neovim/nvim-lspconfig",
  dependencies = {
    -- Automatically install LSPs and related tools to stdpath for Neovim
    -- Mason must be loaded before its dependents so we need to set it up here.
    -- NOTE: `opts = {}` is the same as calling `require('mason').setup({})`
    { "williamboman/mason.nvim", opts = {} },
    "williamboman/mason-lspconfig.nvim",
    "WhoIsSethDaniel/mason-tool-installer.nvim",

    -- Useful status updates for LSP.
    { "j-hui/fidget.nvim", opts = {} },
  },
  config = function()
    vim.api.nvim_create_autocmd("LspAttach", {
      group = vim.api.nvim_create_augroup("kickstart-lsp-attach", { clear = true }),
      callback = function(event)
        local map = function(keys, func, desc, mode)
          mode = mode or "n"
          vim.keymap.set(mode, keys, func, { buffer = event.buf, desc = "LSP: " .. desc })
        end
        map("gd", require("fzf-lua").lsp_definitions, "[G]oto [D]efinition")
        map("gr", require("fzf-lua").lsp_references, "[G]oto [R]eferences")
        map("gI", require("fzf-lua").lsp_implementations, "[G]oto [I]mplementation")
        map("<leader>D", require("fzf-lua").lsp_typedefs, "Type [D]efinition")
        map("<leader>ds", require("fzf-lua").lsp_document_symbols, "[D]ocument [S]ymbols")
        map("<leader>ws", require("fzf-lua").lsp_live_workspace_symbols, "[W]orkspace [S]ymbols")
        map("<leader>cr", vim.lsp.buf.rename, "[R]e[n]ame")
        map("<leader>ca", vim.lsp.buf.code_action, "[C]ode [A]ction", { "n", "x" })
        map("gD", vim.lsp.buf.declaration, "[G]oto [D]eclaration")
        ---@param client vim.lsp.Client
        ---@param method vim.lsp.protocol.Method
        ---@param bufnr? integer some lsp support methods only in specific files
        ---@return boolean
        local function client_supports_method(client, method, bufnr)
          if vim.fn.has("nvim-0.11") == 1 then
            return client:supports_method(method, bufnr)
          else
            return client.supports_method(method, { bufnr = bufnr })
          end
        end

        local client = vim.lsp.get_client_by_id(event.data.client_id)
        if
          client and client_supports_method(client, vim.lsp.protocol.Methods.textDocument_documentHighlight, event.buf)
        then
          local highlight_augroup = vim.api.nvim_create_augroup("kickstart-lsp-highlight", { clear = false })
          vim.api.nvim_create_autocmd({ "CursorHold", "CursorHoldI" }, {
            buffer = event.buf,
            group = highlight_augroup,
            callback = vim.lsp.buf.document_highlight,
          })

          vim.api.nvim_create_autocmd({ "CursorMoved", "CursorMovedI" }, {
            buffer = event.buf,
            group = highlight_augroup,
            callback = vim.lsp.buf.clear_references,
          })

          vim.api.nvim_create_autocmd("LspDetach", {
            group = vim.api.nvim_create_augroup("kickstart-lsp-detach", { clear = true }),
            callback = function(event2)
              vim.lsp.buf.clear_references()
              vim.api.nvim_clear_autocmds({ group = "kickstart-lsp-highlight", buffer = event2.buf })
            end,
          })
        end

        if client and client_supports_method(client, vim.lsp.protocol.Methods.textDocument_inlayHint, event.buf) then
          map("<leader>th", function()
            vim.lsp.inlay_hint.enable(not vim.lsp.inlay_hint.is_enabled({ bufnr = event.buf }))
          end, "[T]oggle Inlay [H]ints")
        end
      end,
    })

    -- Diagnostic Config
    -- See :help vim.diagnostic.Opts
    vim.diagnostic.config({
      severity_sort = true,
      float = { border = "rounded", source = "if_many" },
      underline = { severity = vim.diagnostic.severity.ERROR },
      signs = {
        text = {
          [vim.diagnostic.severity.ERROR] = "󰅚 ",
          [vim.diagnostic.severity.WARN] = "󰀪 ",
          [vim.diagnostic.severity.INFO] = "󰋽 ",
          [vim.diagnostic.severity.HINT] = "󰌶 ",
        },
      },
      virtual_text = {
        source = "if_many",
        spacing = 2,
        format = function(diagnostic)
          local diagnostic_message = {
            [vim.diagnostic.severity.ERROR] = diagnostic.message,
            [vim.diagnostic.severity.WARN] = diagnostic.message,
            [vim.diagnostic.severity.INFO] = diagnostic.message,
            [vim.diagnostic.severity.HINT] = diagnostic.message,
          }
          return diagnostic_message[diagnostic.severity]
        end,
      },
    })

    local capabilities = vim.lsp.protocol.make_client_capabilities()
    local servers = require("lsp")
    local ensure_installed = { "lua_ls" } --vim.tbl_keys(servers or {})
    vim.list_extend(ensure_installed, {
      "stylua", -- Used to format Lua code
    })
    require("mason-tool-installer").setup({ ensure_installed = ensure_installed })

    for name, value in pairs(servers) do --pseudocode
      vim.lsp.config(name, value)
    end

    require("mason-lspconfig").setup({
      ensure_installed = {}, -- explicitly set to an empty table (Kickstart populates installs via mason-tool-installer)
      automatic_installation = false,
    })
  end,
}